Many of these additives were once of natural origin. However, most are now prepared/produced synthetically as these are often less expensive than the natural product.
Types of additives
Additives can be:
We often hear that additives are chemicals that will harm us, and they should be banned. But many food additives actually come from natural sources, such as the red colouring from beetroot plants (beet red) or the purple colour from grape skins (anthocyanins). It is also possible to manufacture additives found in nature, such as ascorbic acid or vitamin C. Other food additives are manufactured for a specific purpose, such as artificial sweeteners like aspartame.
Why do we need additives?
Additives like sugar and salt have been used for centuries to make food last longer. Explorers and pioneers carried salted meat when they set out to discover new lands, and preserving fruit in sugar syrup happened long before the advent of canning and freezing. Additives can improve the quality of our food by making it last longer in the pantry or the fridge (acting as preservatives and humectants). They can also improve the taste or appearance of food (as flavours, thickeners or colours), allowing us to choose from a wider range of foods.Additives must be listed on food labels
All food ingredients, including additives, must be listed on food labels. The function of the additive must be listed, along with its name or code number. For example – thickener (pectin) or thickener (440).
Most food additives have code numbers, which are part of an international numbering system. Code numbers are used as they take up less space on the food label, and also help avoid different additives being confused.
Enzymes and flavours
Enzymes or flavours do not have to be named or identified with a code number on food labels.
Vitamins and minerals
These are not classified as additives under the Food Standards Code, but some have a code number because they are also used as food additives. For example, ascorbic acid (vitamin C) is added to some foods as an antioxidant.
Food additives and allergies
A small number of people may be sensitive or allergic to some food additives – just as some people are allergic to foods like milk or peanuts. Food labels help people with allergies avoid certain additives.
To ensure they are safe, all food additives must go through a rigorous safety assessment process before being approved for use in food. This is done by Food Standards Australia and New Zealand (FSANZ), and any new additive needs to gain approval from government ministers before being used as a food ingredient.
Most food additives are assigned to a class - colours, flavours, sweeteners, etc., and allocated an international code number. Some code numbers start with an ‘E’, which means the food has been labelled for the European market. Food additives are found within the list of ingredients on a food label. Each additive will be listed by its class name, followed by the additive’s name or code number in brackets. For example, Thickener (pectin) or Thickener (440).
Some additives play an essential part in keeping our food safe, but others may be responsible for unpleasant reactions.
MSG was first added to Western food in 1948, and is now one of the world's most widely used additives. It is commonly found in Chinese food, packet soups, canned vegetables, and processed meats. Ever since its introduction, there have been reports of reactions, known as the ''Chinese restaurant syndrome''.
The symptoms may include shortness of breath, heart palpitations, chest pain, or swelling of the lips or throat.
The following symptoms can all be associated with an intolerance to food additives:
- Headaches or migraines.
- Tightness in the chest, neck and face.
- Flushing and sweating.
- Heart palpitations.
- Chest pain.
- Nausea and other gut symptoms.
The symptoms are usually mild and don't require any medical intervention. However, in some people they can be quite debilitating. If you think you may have an intolerance to an additive, keep a detailed food diary, looking carefully at what you have eaten during the preceding 24 to 48 hours. This should allow any patterns to emerge, and then you may be able to start eliminating things in your diet to test your theory.
Colours are used to give the appearance of freshness, to make foods look more natural, to replace colour lost during processing, and to make foods more appealing.
Colours are often mixed together in desserts and sweets and some packets of biscuits can contain up to seven different colours in them.
Coloured foods tend to be marketed at children and in terms of body weight, it is estimated children eat considerably more colour than adults.
Overseas estimates suggest children could consume about 59 to 300 mg of artificial colouring a day while a survey by the NZ Safe Food Campaign found children on a diet containing many processed foods such as chips, soft drinks and biscuits could easily consume 35-40 different doses of 14-different colours every day.
Our government allows 47 colours in our food, including 10 controversial synthetic dyes banned overseas because of concerns about their safety.
There are two types of food dyes: natural or nature-identical dyes, and synthetic dyes that are mostly coar-tar derivatives. These are formed from chemical compounds produced when coal is distilled, and are used in textiles, inks, paints, cosmetics, pharmaceuticals and pesticides as well as foods.
We recommend you avoid the
following dyes, which are linked to a wide range of allergic reactions
including asthma, hyperactivity and skin rashes. Some colours have been linked
to carcinogenic tumours in laboratory animals:
Some studies have shown that eating foods containing synthetic colours may affect behaviour in children and teenagers. Others suggest these colours may pose a health risk. Learn more about synthetic colours, why they're used, and how they may affect health.
Why are synthetic colours used?
Food manufacturers add colours to food to improve its attractiveness. Synthetic colours are used instead of natural colours because they are:
Reactions to synthetic colours
Synthetic food colours, particularly tartrazine, have occasionally been linked to adverse reactions like asthma and allergy-like reactions like rashes and headaches. These cases are rare and usually occur only in people who have other allergies.
Synthetic food colours have also been linked to hyperactivity in children and teenagers.
Benzoates, sorbates & sulphites (preservatives)
Benzoates, sorbates and sulphites are preservatives added to foods to extend their shelf-life. Learn more about these chemicals and how their use is controlled.
210 Benzoic acid
211 Sodium benzoate
212 Potassium benzoate
213 Calcium benzoate
216 Propylparaben or Propyl — p-hydroxy-benzoate
218 Methylparaben or Methyl-p-hydroxy-benzoate
Benzoates are tasteless, odourless preservatives used in some fruit juices, cordial, soft drinks, sauces and toppings, margarine, jam, pickles, chutney, cider, coconut milk, non-canned, preserved fish, milk-shake syrups and concentrated tomato juice.
Benzoates have been linked to allergies, asthma, skin reactions, hyperactivity, gastric irritation, and migraines. When used in combination with sodium bisulphate (222), the reactions for asthmatics may be even more severe.
Benzoate can affect the natural balance of bacteria in the intestines. Tests have found benzoates produce toxic effects in many species and the Soviet Union, heavily restricts their use.
Regulatory bodies such as JECFA (the joint FAO/WHO Expert Committee on Food Additives) acknowledge that benzoic acid can provoke allergy and intolerance in some people, especially those who suffer from asthma, hyperactivity and urticaria.
Nitrates and Nitrites
249 Potassium nitrite
250 Sodium nitrite
251 Sodium nitrate
252 Potassium nitrate
Nitrites and nitrates are used to prevent highly toxic bacteria that cause botulism food poisoning from developing in red meat and fish. They also perform a cosmetic function by turning processed meat pink.
They are found in virtually all cooked and cured meat, sausages, bacon, ham, frankfurters, hot dogs, salami, corned beef, pate and luncheon sausage, and may also be used in fresh meat and chicken that has been prepared in some way for sale.
Nitrates can convert into nitrites in the body. When nitrites combine with other chemicals called amines in the gastric juices of the stomach, they can form chemicals called nitrosamines, which have been linked to the development of cancers in many species of animals.
JECFA (the joint FAO/WHO Expert Committee on Food Additives) says it is "highly probable" that nitrites are carcinogenic in humans. Nitrites are heavily restricted in some European countries. They are not permitted in organic foods in NZ.
Antioxidants stop oils and fats from going rancid. They also stop food going brown or developing black spots, and they prevent artificial flavourings and colourings from decomposing. Twenty-four different antioxidants are permitted for use in New Zealand food, including:
320 Butylated hydroxyanisole (BHA)
321 Butylated hydroxytoluene (BHT)
BHA and BHT are used in hundreds of processed foods and it is easy to consume more than the recommended daily amount. Synthetically manufactured, petroleum-based and fat-soluble, these antioxidants are found in chips, fried snack foods and baked foods such as biscuits.
They are also found in some vegetable oils, shortening, lard, fat, margarine, carbonated drinks, cheese spreads, chewing gum, ice cream, dry breakfast cereal, cosmetics, animal feeds and drugs.
They have been linked to hyperactivity and other allergic reactions such as rashes and asthma as well as other ill-health effects in humans. They accumulate in body fat.
In animal tests, BHT has caused liver cancer and lung tumours, increased blood cholesterol, reduced growth rates and body weight and been linked to birth defects in rats.
A Japanese study found BHA caused cancerous tumours in the fore-stomachs of rats, mice and hamsters leading to the Japanese Government banning it from food.
Some European countries heavily restrict use of BHA and BHT, but in New Zealand it can be used up to 100ppm in food.
There are 15 different artificial sweeteners permitted in New Zealand
950 Acesulphame K (or potassium)
952 Sodium or Calcium cyclamate
Initially targeted at diabetics, artificial sweeteners have boomed on
the food and drink market as the demand for diet-food products has increased.
Cheaper to produce than sugar, they are found in foods marketed as 'low-calorie', 'lite', 'diet', and 'low-sugar' such as biscuits, sweets, jams, soft drinks, sauces, breath mints and diet desserts.
These controversial sweeteners lack the minerals found in unrefined cane sugars and there have been health scares and safety concerns about nearly every one of them available on the market.
Saccharin has been found to cause bladder cancer in male rats and is considered a possible carcinogen by the American Environmental Protection Agency (EPA).
In the US, food containing saccharin must be labelled with a warning that use of this product may be hazardous to health and has caused cancer in laboratory animals. In New Zealand no label warning is required.
Cyclamate is banned in the US and Canada and many other countries after animal testing linked it to liver damage, bladder cancer, birth mutations and defects, reduces testosterone and can shrivel testes.
It is permitted in New Zealand where it is often mixed with saccharin.
Aspartame is widely used in New Zealand despite some people claiming it triggers head aches, blurred vision, epileptic fits and brain tumours, as well as eye problems, numbness, insomnia, memory loss, nausea, slurred speech, personality changes, loss of energy, hyperactivity and hearing problems.
There have been more consumer complaints about aspartame than any other
additive. The Aspartame Consumer Network has received more than 10,000
complaints of adverse reactions to aspartame from all over the world and more
than 75% of complaints to the US Food and Drug Authority's Adverse Reaction
Monitoring System are about adverse reactions to aspartame.
180-times sweeter than natural sugar, it is found in diet, low-calorie, lite, or sugar-free products and in anything with the NutraSweet or Equal logo.
Acesulphame K is a sugar substitute sold under the brand name "Sunnet". Used in many processed foods, it leaves a bitter after-taste so is often combined with sugar, aspartame or other sweeteners.
It was approved for use in New Zealand food and drink in 1991 despite overseas animal tests linking it to lung tumours, leukaemia and chronic respiratory disease.
Acesulphame K can stimulate insulin secretion and aggravate hypoglycaemia.
Sucralose is a non-caloric sweetener created from sugar that is permitted in New Zealand foods aimed at diabetics and in some yoghurts and confectionary. In one animal experiment, the thymus in rats fed a sucralose-rich diet shrunk by up to 40-percent.
The thymus gland plays a key role in the functioning of the immune system. Liver and kidneys were also negatively affected by consuming this product.
There are 14 of these, of which the most well known is:
621 Monosodium Glutamate
This controversial flavour enhancer is widely used in processed foods. It is added to bland food to enhance the flavour, and to restore flavour lost in food during processing. It stimulates the taste buds on the tongue and gives food the impression of being more flavoursome than it really is.
MSG is added to hundreds of food products including most processed and packeted soups and sauces, flavoured noodles, fast foods, canned foods, ready-made dinners, seafoods, meat products such as sausages and pies, processed cheeses, soy sauce and miso. It is also widely used in restaurants, take-away foods and Chinese foods.
MSG has been linked to heart palpitations, headaches, dizziness, muscle-tightening, nausea, numbness radiating from the back of the neck, tingling in the face, back and arms and symptoms similar to migraines.
It can also trigger asthma in asthmatics. In animal studies, it's been linked to the destruction of brain cells and nerve cells in newborn rats and mice. Because children's brains do not have properly developed blood/brain barriers, MSG is banned from foods prepared especially for babies and young children.
Monosodium glutamate or MSG
Monosodium glutamate (MSG) is used to bring out the flavour in food. MSG is safe for most people, though may cause temporary allergy-type reactions in some.
926 Chlorine dioxide
These are not listed in the government's food additives guide.
Chlorine dioxide is used to bleach flour white and chlorine residues can
be found in some breads, cakes and puddings. There have been concerns raised
about the safety of chlorine bleaches because chlorine is a highly reactive gas
that combines rapidly with organic matter to produce toxic organochlorine
When chlorine is used to bleach flour, it destroys much of the vitamin E content and may produce toxic residues. Many overseas bread manufacturers no longer use bleached flour in their white bread.
Children are particularly sensitive to caffeine and can become hyperactive, nervous and have difficulty sleeping. Caffeine affects the nervous system and some scientists are concerned that brain growth and development may be affected in children who consume too much.
Caffeine is present in many soft drinks and smart drinks and children drinking several of these products could easily consume the equivalent of four to six cups of coffee a day.